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There is a brick wall in our condo that is part of the exterior building that was never meant to be used as an interior wall. We were hoping to insulate it and we saw recommendations for using XPS (extruded polystyrene foam) but I was wondering what the next step would be after that.

Would I have to create an entire frame and put drywall up after that or is there a cheaper option without reverting to plaster? If a frame is required is it ok to create a more lightweight version within slimmer wood and drywall?

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Do you have any idea how old the brick is that you wish to attach the brick to? With the proper fasteners and adhesive, you can laminate the foam to the brick with adhesive, cover with drywall held to the foam with adhesive and nail through the layers to hold it in place until the glue dries, then finish and paint the wall –  Jack Mar 1 at 22:05
    
Sorry, first line should read, Do you have any idea how old the brick is that you wish to attach the insulation to? It may have been easy to sort out, but I wanted to clarify. –  Jack Mar 2 at 15:08

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